OpenAPIHono not correctly inferring types from responses when using variables as keys

[kmallari]

Actual Result

If I have a route like this:

import { createRoute, OpenAPIHono, z } from "@hono/zod-openapi"
import { StatusCodes } from "http-status-codes"

export const healthCheck = new OpenAPIHono<{ Variables: ContextVariables }>().openapi(
  createRoute({
    method: "get",
    path: "/health",
    tags: ["Health"],
    summary: "App health check",
    request: {},
    responses: {
      [StatusCodes.OK]: {
        description: "Success",
        content: {
          "application/json": {
            schema: healthCheckSchema.openapi("HealthCheck", {
              example: {
                server: "healthy",
                db: "healthy",
              },
            }),
          },
        },
      },
      [StatusCodes.INTERNAL_SERVER_ERROR]: {
        description: "Server failure.",
      },
    },
  }),
...

The REST method for get will get inferred as never

even though StatusCodes.OK is equal to 200

If I change [StatusCodes.OK] and [StatusCodes.INTERNAL_SERVER_ERROR] to 200 and 500 respectively, the types are inferred correctly.

Request

Be able to infer the type correctly, as long as the key is a valid HTTP code. This results in the RPC not being useable since _rpc_.$get() errors out since $get is inferred as never